By comprehensive utilization of biogas rural economics and eco - environmental sanitation can be improved and good ecological cycle can be formed.
开展沼气综合利用，能够促进农村生态环境的良性循环，改善农村环境卫生条件。
The eco-environmental system tends to change and becomes deteriorated with the changes of water resources in utilization and distribution patterns.
伴随着水资源利用分布格局的改变，河西走廊生态环境体系不断演变并趋于恶化。
The problems of eco-environment of Shiyang valley are serious. The main factors of them are high pressure of population to environment and irrational utilization of water resources and so on.
石羊河流域生态环境存在着严重的问题，主要是由于人口对生态环境的压力过大、水资源利用不当等因素引起的；
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